Which of the following best summarizes how atmospheric concentrations of carbon dioxide change throughout the course of a year?
A. They tend to remain stable.
B. They tend to go up and down.
C. They tend to keep decreasing.
D. They tend to keep increasing.
Answer: B
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Until the Industrial Revolution of the late 1700s, the volume and velocity of world trade were constrained by technologies limited to those based on
A) wood, wind and water. B) coal, steel and rail. C) oil, plastics and roads. D) human labor and animal power.
only ______ of the Sun's energy reaches the earth.
a - 1 millionth b - 2 millionth c - 1 trillionth d - 1 billionth e - 2 billionth
The influence of large lakes or oceans generally reduces the annual temperature range
Indicate whether the statement is true or false
A stream can lengthen its valley by headward erosion.
Answer the following statement true (T) or false (F)